00:01
Hi there, so for this problem we are told the direction of shell, colon, india snail, limini, paragraph results from genetic maternal effort, an autosomal allele for a right -handed or dastral shell is dominant to the allel for the left -handed or sinistered shell.
00:29
A pet snail called jada is sinistral and reproduces only as female.
00:36
The snails are amofordid.
00:39
And moffered it indicate which of the following statements are true and which are false.
00:45
And explain your reasoning.
00:46
Okay.
00:47
So the first statement is that jada genotype must be s -s.
01:02
So this right away, we know that is false.
01:09
This is because genus phenotype is sinister, but her genotype could be either s or s plus s.
01:20
The shell -coiling direction in the offspring depends on the motor genotype due to the maternal effort, not directly on the genotype of the snail itself.
01:34
Therefore, while jada's phenotype is sinister, her genotype isn't necessarily as s, since her phenotype depends on her mother's genotype.
01:52
Now, for two, we have jada's.
01:59
Okay, so the next one is jada's genotype cannot be s plus s plus.
02:13
Now, this is true.
02:20
This is because for jetta to exhibit the sinisteral phenotype, her mother must have passed out the resistive allel.
02:28
Therefore, jada cannot have the genotype s plus s plus since s plus is dominant and will result in a dastral phenotype.
02:37
Now, for 3, we have that all of the off -stream by jada...